Researchers analyzed two European pregnancy study groups comprising about 7,500 parents and children, and found no consistent link between pre-pregnancy maternal overweight and nonverbal skills, verbal skills, behavioral problems as a whole, hyperactivity, and attention issues in kids.

There were some initial hints of an association between maternal pre-pregnancy weight and verbal skills, total behavioral problems, and externalizing problems such as aggression, delinquency, and hyperactivity, but this link was not substantiated between the two study groups.

Dad’s weight was not associated with any behavior or cognition problems in offspring either, the new study shows.

The guiding theory was that there was something going on in the uterus during pregnancy that could increase risk for these problems in offspring, but the new study seems to debunk this theory. Certain socioeconomic or post-pregnancy factors such as lower socioeconomic status may increase the risk of behavior and cognition issues in offspring.

“We find little consistent evidence for intrauterine effects of maternal pre-pregnancy overweight on childhood verbal skills, nonverbal skills and behavioral problems,” conclude study researcher Marie-Jo Brion, PhD, of the University of Bristol and colleagues. “Previously reported finding of an association with childhood ADHD and intellectual function is not supported by the present study.”

Maternal Obesity

Manju Monga MD, Berel Held Professor and division director of maternal-fetal medicine at the University of Texas Health Sciences Center in Houston, says “this study does not appear to support other studies that suggest an association between maternal obesity and early childhood intelligence/verbal skills or behavioral problems.”

However, she tells WebMD in an email, “Maternal obesity is associated with an increased risk of pregnancy and postpartum complications such as fetal neural tube defects, gestational diabetes, preeclampsia, cesarean delivery, postoperative infection, fetal macrosomia (large babies) and childhood obesity, so optimization of maternal weight prior to conception is recommended.”

“More research is needed,” she says, “before the results of this study can be generalized to pregnant women in the United States.”